<template>
  <div class="bgView">
    <div :class="['json-view', length ? 'closeable' : '']" :style="'font-size:' + fontSize+'px'">
    <span @click="toggleClose" :class="['angle', innerclosed ? 'closed' : '']" v-if="length">
    </span>
      <div class="content-wrap">
        <p class="first-line">
          <span v-if="jsonKey" class="json-key">"{{jsonKey}}": </span>
          <span v-if="length">
          {{prefix}}
          {{innerclosed ? ('...' + subfix) : ''}}
          <span class="json-note">
           {{innerclosed ? (' // count: ' + length) : ''}}
          </span>
        </span>
          <span v-if="!length">{{isArray ? '[]' : '{}'}}</span>
        </p>
        <div v-if="!innerclosed && length" class="json-body">
          <template v-for="(item, index) in items">
            <json-view :closed="closed" v-if="item.isJSON" :key="index" :json="item.value"
                       :jsonKey="item.key" :isLast="index === items.length - 1"></json-view>
            <p class="json-item" v-else :key="index">
            <span class="json-key">
                {{(isArray ? '' : '"' + item.key + '"')}}
            </span>
              :
              <span class="json-value">
                {{item.value + (index === items.length - 1 ? '' : ',')}}
            </span>
            </p>
          </template>
          <span v-show="!innerclosed" class="body-line"></span>
        </div>
        <p v-if="!innerclosed && length" class="last-line">
          <span>{{subfix}}</span>
        </p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'JsonView',
  props: {
    json: [Object, Array],
    jsonKey: {
      type: String,
      default: ''
    },
    closed: {
      type: Boolean,
      default: false
    },
    isLast: {
      type: Boolean,
      default: true
    },
    fontSize: {
      type: Number,
      default: 13
    }
  },
  created() {
    this.innerclosed = this.closed
    this.$watch('closed', () => {
      this.innerclosed = this.closed
    })
  },
  data() {
    return {
      innerclosed: true
    }
  },
  methods: {
    isObjectOrArray(source) {
      const type = Object.prototype.toString.call(source)
      const res = type === '[object Array]' || type === '[object Object]'
      return res
    },
    toggleClose() {
      if (this.innerclosed) {
        this.innerclosed = false
      } else {
        this.innerclosed = true
      }
    }
  },
  computed: {
    isArray() {
      return Object.prototype.toString.call(this.json) === '[object Array]'
    },
    length() {
      return this.isArray ? this.json.length : Object.keys(this.json).length
    },
    subfix() {
      return (this.isArray ? ']' : '}') + (this.isLast ? '' : ',')
    },
    prefix() {
      return this.isArray ? '[' : '{'
    },
    items() {
      if (this.isArray) {
        return this.json.map(item => {
          const isJSON = this.isObjectOrArray(item)
          return {
            value: isJSON ? item : JSON.stringify(item),
            isJSON,
            key: ''
          }
        })
      }
      const json = this.json
      return Object.keys(json).map(key => {
        const item = json[key]
        const isJSON = this.isObjectOrArray(item)
        return {
          value: isJSON ? item : JSON.stringify(item),
          isJSON,
          key
        }
      })
    }
  }
}
</script>

<style scoped>
.bgView {
  background-color: #fafafa;
}

.json-view {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  white-space: nowrap;
  padding-left: 20px;
  box-sizing: border-box;
}

.json-note {
  color: #909399;
}

.json-key {
  color: rgb(147, 98, 15);
}

.json-value {
  color: rgb(24, 186, 24);
}

.json-item {
  margin: 0;
  padding-left: 20px;
}

.first-line {
  padding: 0;
  margin: 0;
}

.json-body {
  position: relative;
  padding: 0;
  margin: 0;
}

.json-body .body-line {
  position: absolute;
  height: 100%;
  width: 0;
  border-left: dashed 1px #bbb;
  top: 0;
  left: 2px;
}

.last-line {
  padding: 0;
  margin: 0;
}

.angle {
  position: absolute;
  display: block;
  cursor: pointer;
  float: left;
  width: 20px;
  text-align: center;
  left: 0;
}

.angle::after {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  vertical-align: middle;
  border-top: solid 4px #333;
  border-left: solid 6px transparent;
  border-right: solid 6px transparent;
}

.angle.closed::after {
  border-left: solid 4px #333;
  border-top: solid 6px transparent;
  border-bottom: solid 6px transparent;
}
</style>
